Eyewear with dynamic voltage rails to remote loads

ABSTRACT

Eyewear including a voltage controller in the frame that generates dynamic analog control signals to control voltage regulators in the temple. The voltage regulators include a voltage rail for each electronic component in the temple. A separate analog control loop is coupled to each voltage regulator and receives the respective analog control signal. Each voltage regulator generates a rail voltage on the respective voltage rail that is controlled by the respective analog control signal. The analog control loop configures the respective voltage regulator as a voltage follower regulator such that the respective rail voltage follows a voltage of the analog control signal. A power source, such as a battery, is included in the temple and provides the operating power to each electronic component, and power is not communicated across a hinge to the temple electronic components.

TECHNICAL FIELD

The present subject matter relates to electronic eyewear devices, e.g.,smart glasses having cameras and see-through displays.

BACKGROUND

Electronic eyewear devices, such as smart glasses, headwear, andheadgear available today integrate various electronic components such ascameras, see-through displays, and processors. Such devices includewiring extending through hinges to electrically connect the variouselectronic components in a frame and a temple and supply power tomultiple loads.

BRIEF DESCRIPTION OF THE DRAWINGS

Features of the various implementations disclosed will be readilyunderstood from the following detailed description, in which referenceis made to the appended drawing figures. A reference numeral is usedwith each element in the description and throughout the several views ofthe drawing. When a plurality of similar elements is present, a singlereference numeral may be assigned to like elements, with an added letterreferring to a specific element.

The various elements shown in the figures are not drawn to scale unlessotherwise indicated. The dimensions of the various elements may beenlarged or reduced in the interest of clarity. The several figuresdepict one or more implementations and are presented by way of exampleonly and should not be construed as limiting. Included in the drawingare the following figures:

FIG. 1A is a side view of an example electronic eyewear device includingan optical assembly with an image display;

FIG. 1B is a top cross-sectional view of optical components andelectronics in a portion of the electronic eyewear device illustrated inFIG. 1A;

FIG. 2A is a rear view of an example electronic eyewear device;

FIG. 2B is a rear view of an example electronic eyewear device;

FIG. 2C is a rear view of an example electronic eyewear device depictingan image display;

FIG. 2D is a rear view of an example electronic eyewear device depictingan image display;

FIG. 3 is a cross-sectional rear perspective view of the electroniceyewear device of FIG. 2A depicting an infrared emitter, an infraredcamera, a frame front, a frame back, and a circuit board;

FIG. 4 is a cross-sectional view through the infrared emitter and theframe of the electronic eyewear device of FIG. 3 ;

FIG. 5 is a top view illustrating detection of eye gaze direction;

FIG. 6 is a top view illustrating detection of eye position;

FIG. 7 is a block diagram depicting capture of visible light by visiblelight cameras;

FIG. 8A is a block diagram illustrating a power management integratedcircuit (PMIC) providing dynamic voltage rails to peripheral componentseach having analog control loop and a voltage regulator;

FIG. 8B is a block diagram of a control loop circuit;

FIG. 9 is a block diagram of electronic components of the electroniceyewear device; and

FIG. 10 is a flowchart of a method of the PMIC providing high-impedanceanalog control signals to the analog control loops controlling voltagefollower regulators.

DETAILED DESCRIPTION

Eyewear including a voltage controller in the frame that generatesdynamic analog control signals to control voltage regulators in thetemple. The voltage regulators provide a voltage rail for eachelectronic component in the temple. A separate analog control loopcircuit is coupled to each voltage regulator and receives a respectiveanalog control signal. Each voltage regulator generates the rail voltageat its output that is controlled by the respective analog controlsignal. The analog control loop circuit configures the respectivevoltage regulator as a voltage follower regulator such that therespective rail voltage follows a voltage of the analog control signal.A power source, such as a battery, is housed in the temple and providesthe operating power to each electronic component. The battery providespower to each of the voltage regulators such that power is notcommunicated via large wires across a space constrained hinge to thetemple electronic components. Locally providing power to the regulatorsis a streamlined arrangement and power efficient.

Additional objects, advantages and novel features of the examples willbe set forth in part in the description which follows, and in part willbecome apparent to those skilled in the art upon examination of thefollowing and the accompanying drawings or may be learned by productionor operation of the examples. The objects and advantages of the presentsubject matter may be realized and attained by means of themethodologies, instrumentalities and combinations particularly pointedout in the appended claims.

In the following detailed description, numerous specific details are setforth by way of examples to provide a thorough understanding of therelevant teachings. However, it should be apparent to those skilled inthe art that the present teachings may be practiced without suchdetails. In other instances, well known methods, procedures, components,and circuitry have been described at a relatively high-level, withoutdetail, to avoid unnecessarily obscuring aspects of the presentteachings.

The term “coupled” as used herein refers to any logical, optical,physical, or electrical connection, link or the like by which signals orlight produced or supplied by one system element are imparted to anothercoupled element. Unless described otherwise, coupled elements or devicesare not necessarily directly connected to one another and may beseparated by intermediate components, elements or communication mediathat may modify, manipulate, or carry the light or signals.

The orientations of the electronic eyewear device, associated componentsand any complete devices incorporating an eye scanner and camera such asshown in any of the drawings, are given by way of example only, forillustration and discussion purposes. In operation for a particularvariable optical processing application, the electronic eyewear devicemay be oriented in any other direction suitable to the particularapplication of the electronic eyewear device, for example up, down,sideways, or any other orientation. Also, to the extent used herein, anydirectional term, such as front, rear, inwards, outwards, towards, left,right, lateral, longitudinal, up, down, upper, lower, top, bottom andside, are used by way of example only, and are not limiting as todirection or orientation of any optic or component of an opticconstructed as otherwise described herein.

Reference now is made in detail to the examples illustrated in theaccompanying drawings and discussed below.

FIG. 1A is an illustration depicting a side view of an example hardwareconfiguration of an electronic eyewear device 100 including an opticalassembly 180A with an image display 180C (FIG. 2A). Electronic eyeweardevice 100 includes multiple visible light cameras 114A and 114B (FIG. 3) that form a stereo camera, of which the first visible light camera114A is located on a right temple 110A and the second visible lightcamera 114B is located on a left temple 110B (FIG. 2A). In theillustrated example, the optical assembly 180A is located on the rightside of the electronic eyewear device 100. The optical assembly 180A canbe located on the left side or other locations of the electronic eyeweardevices 100.

The visible light cameras 114A and 114B may include an image sensor thatis sensitive to the visible light range wavelength. Each of the visiblelight cameras 114A and 114B has a different frontward facing angle ofcoverage, for example, visible light camera 114A has the depicted angleof coverage 111A (FIG. 3 ). The angle of coverage is an angle range inwhich the respective image sensor of the visible light cameras 114A and114B detects incoming light and generates image data. Examples of suchvisible lights cameras 114A and 114B include a high-resolutioncomplementary metal-oxide-semiconductor (CMOS) image sensor and a videographic array (VGA) camera, such as 640p (e.g., 640×480 pixels for atotal of 0.3 megapixels), 720p, 1080p, 4K, or 8K. Image sensor data fromthe visible light cameras 114A and 114B may be captured along withgeolocation data, digitized by an image processor, and stored in amemory.

To provide stereoscopic vision, visible light cameras 114A and 114B maybe coupled to an image processor (element 912 of FIG. 9 ) for digitalprocessing and adding a timestamp corresponding to the scene in whichthe image is captured. Image processor 912 may include circuitry toreceive signals from the visible light cameras 114A and 114B and toprocess those signals from the visible light cameras 114A and 114B intoa format suitable for storage in the memory (element 934 of FIG. 9 ).The timestamp may be added by the image processor 912 or other processorthat controls operation of the visible light cameras 114A and 114B.Visible light cameras 114A and 114B allow the stereo camera to simulatehuman binocular vision. Stereo cameras also provide the ability toreproduce three-dimensional images of a three-dimensional scene (scene715 of FIG. 7 ) based on two captured images (image pairs 758A and 758Bof FIG. 3 ) from the visible light cameras 114A and 114B, respectively,having the same timestamp. Such three-dimensional images allow for animmersive virtual experience that feels realistic, e.g., for virtualreality or video gaming. For stereoscopic vision, the pair of images758A and 758B may be generated at a given moment in time—one image foreach of the visible light cameras 114A and 114B. When the pair ofgenerated images 758A and 758B from the frontward facing field of view(FOV) 111A and 111B of the visible light cameras 114A and 114B arestitched together (e.g., by the image processor 912), depth perceptionis provided by the optical assemblies 180A and 180B.

In an example, the electronic eyewear device 100 includes a frame 105, aright rim 107A, a right temple 110A extending from a right lateral side170A of the frame 105, and a see-through image display 180C (FIGS. 2A-B)comprising optical assembly 180A to present a GUI or other image to auser. The electronic eyewear device 100 includes the first visible lightcamera 114A connected to the frame 105 or the right temple 110A tocapture a first image of the scene. Electronic eyewear device 100further includes the second visible light camera 114B connected to theframe 105 or the left temple 110B to capture (e.g., simultaneously withthe first visible light camera 114A) a second image of the scene whichat least partially overlaps the first image. Although not shown in FIGS.1A and 1B, a high speed (HS) processor 932 (FIG. 9 ) is coupled to theelectronic eyewear device 100 and is connected to the visible lightcameras 114A and 114B and memory 934 (FIG. 9 ) accessible to theprocessor 932, and programming in the memory 934 may be provided in theelectronic eyewear device 100 itself.

Although not shown in FIG. 1A, the electronic eyewear device 100 alsomay include a head movement tracker (element 109 of FIG. 1B) or an eyemovement tracker (element 113 of FIG. 2A or element 213 of FIGS. 2B and2C). Electronic eyewear device 100 may further include the see-throughimage displays 180C and D of optical assemblies 180A and 180B,respectively, for presenting a sequence of displayed images. Theelectronic eyewear devices 100 may further include an image displaydriver (element 924 of FIG. 9 ) coupled to the see-through imagedisplays 180C and 180D to drive the image displays 180C and 180D. Thesee-through image displays 180C and 180D and the image display driverare described in further detail below. Electronic eyewear device 100 mayfurther include the memory 934 and the processor 932 (FIG. 9 ) havingaccess to the image display driver 924 and the memory 934, as well asprogramming in the memory 934. Execution of the programming by theprocessor 932 configures the electronic eyewear device 100 to performfunctions, including functions to present, via the see-through imagedisplays 180C and 180D, an initial displayed image of the sequence ofdisplayed images, the initial displayed image having an initial field ofview corresponding to an initial head direction or an initial eye gazedirection as determined by the eye movement tracker 113 or 213.

Execution of the programming by the processor 932 may further configurethe electronic eyewear device 100 to detect movement of a user of theelectronic eyewear device 100 by: (i) tracking, via the head movementtracker (element 109 of FIG. 1B), a head movement of a head of the user,or (ii) tracking, via an eye movement tracker (element 113 of FIG. 2A orelement 213 of FIGS. 2B and 2C), an eye movement of an eye of the userof the electronic eyewear device 100. Execution of the programming bythe processor 932 may further configure the electronic eyewear device100 to determine a field of view adjustment to the initial field of viewof the initial displayed image based on the detected movement of theuser. The field of view adjustment may include a successive field ofview corresponding to a successive head direction or a successive eyedirection. Execution of the programming by the processor 932 may furtherconfigure the electronic eyewear device 100 to generate successivedisplayed images of the sequence of displayed images based on the fieldof view adjustment. Execution of the programming by the processor 932may further configure the electronic eyewear device 100 to present, viathe see-through image displays 180C and 180D of the optical assemblies180A and 180B, the successive displayed images.

FIG. 1B is an illustration depicting a top cross-sectional view ofoptical components and electronics in a portion of the electroniceyewear device 100 illustrated in FIG. 1A depicting the first visiblelight camera 114A, a head movement tracker 109, and a circuit board 140.Construction and placement of the second visible light camera 114B issubstantially similar to the first visible light camera 114A, except theconnections and coupling are on the other lateral side 170B (FIG. 2A).As shown, the electronic eyewear device 100 includes the first visiblelight camera 114A and a circuit board, which may be a flexible printedcircuit board (PCB) 140. A first hinge 126A connects the right temple110A to a hinged arm 125A of the electronic eyewear device 100. In someexamples, components of the first visible light camera 114A, theflexible PCB 140, or other electrical connectors or contacts may belocated on the right temple 110A or the first hinge 126A.

Also shown in FIG. 1B is an electrically conductive shield can 142coupled to, and disposed between, a RF ground plate 144 and the PCB 140.The shield can 142 has a cavity that encompasses RF electroniccomponents, such as low-power wireless circuitry 924 and high-speedwireless circuitry 936 shown in FIG. 9 , and it provides an RF ground tothe RF electrical components. The shield can 142 provides an RF shieldto prevent spurious RF signals from emitting outside of the shield can.The shield can 142 also provides a ground for safety and electro-staticdischarge protection, and which can form as part of an antenna designsuch as a ground plane.

As shown, electronic eyewear device 100 may include a head movementtracker 109, which includes, for example, an inertial measurement unit(IMU). An inertial measurement unit is an electronic device thatmeasures and reports a body's specific force, angular rate, andsometimes the magnetic field surrounding the body, using a combinationof accelerometers and gyroscopes, sometimes also magnetometers. Theinertial measurement unit works by detecting linear acceleration usingone or more accelerometers and rotational rate using one or moregyroscopes. Typical configurations of inertial measurement units containone accelerometer, gyroscope, and magnetometer per axis for each of thethree axes: horizontal axis for left-right movement (X), vertical axis(Y) for top-bottom movement, and depth or distance axis for up-downmovement (Z). The accelerometer detects the gravity vector. Themagnetometer defines the rotation in the magnetic field (e.g., facingsouth, north, etc.) like a compass that generates a heading reference.The three accelerometers detect acceleration along the horizontal,vertical, and depth axis defined above, which can be defined relative tothe ground, the electronic eyewear device 100, or the user wearing theelectronic eyewear device 100.

Electronic eyewear device 100 may detect movement of the user of theelectronic eyewear device 100 by tracking, via the head movement tracker109, the head movement of the user's head. The head movement includes avariation of head direction on a horizontal axis, a vertical axis, or acombination thereof from the initial head direction during presentationof the initial displayed image on the image display. In one example,tracking, via the head movement tracker 109, the head movement of theuser's head includes measuring, via the inertial measurement unit, theinitial head direction on the horizontal axis (e.g., X axis), thevertical axis (e.g., Y axis), or the combination thereof (e.g.,transverse or diagonal movement). Tracking, via the head movementtracker 109, the head movement of the user's head further includesmeasuring, via the inertial measurement unit, a successive headdirection on the horizontal axis, the vertical axis, or the combinationthereof during presentation of the initial displayed image.

Tracking, via the head movement tracker 109, the head movement of theuser's head may include determining the variation of head directionbased on both the initial head direction and the successive headdirection. Detecting movement of the user of the electronic eyeweardevice 100 may further include in response to tracking, via the headmovement tracker 109, the head movement of the user's head, determiningthat the variation of head direction exceeds a deviation angle thresholdon the horizontal axis, the vertical axis, or the combination thereof.In sample configurations, the deviation angle threshold is between about3° to 10°. As used herein, the term “about” when referring to an anglemeans±10% from the stated amount.

Variation along the horizontal axis slides three-dimensional objects,such as characters, Bitmojis, application icons, etc. in and out of thefield of view by, for example, hiding, unhiding, or otherwise adjustingvisibility of the three-dimensional object. Variation along the verticalaxis, for example, when the user looks upwards, in one example, displaysweather information, time of day, date, calendar appointments, etc. Inanother example, when the user looks downwards on the vertical axis, theelectronic eyewear device 100 may power down.

As shown in FIG. 1B, the right temple 110A includes temple body 211 thatis configured to receive a temple cap, with the temple cap omitted inthe cross-section of FIG. 1B. Disposed inside the right temple 110A arevarious interconnected circuit boards, such as PCBs or flexible PCBs140, that include controller circuits for first visible light camera114A, microphone(s) 130, speaker(s) 132, low-power wireless circuitry(e.g., for wireless short-range network communication via BLUETOOTH®),and high-speed wireless circuitry (e.g., for wireless local area networkcommunication via WI-FI® and positioning via GPS).

The first visible light camera 114A is coupled to or disposed on theflexible PCB 140 and covered by a visible light camera cover lens, whichis aimed through opening(s) formed in the right temple 110A. In someexamples, the frame 105 connected to the right temple 110A includes theopening(s) for the visible light camera cover lens. The frame 105 mayinclude a front-facing side configured to face outwards away from theeye of the user. The opening for the visible light camera cover lens maybe formed on and through the front-facing side. In the example, thefirst visible light camera 114A has an outward facing angle of coverage111A with a line of sight or perspective of the right eye of the user ofthe electronic eyewear device 100. The visible light camera cover lensalso can be adhered to an outward facing surface of the right temple110A in which an opening is formed with an outward facing angle ofcoverage, but in a different outwards direction. The coupling can alsobe indirect via intervening components.

The first visible light camera 114A may be connected to the firstsee-through image display 180C of the first optical assembly 180A togenerate a first background scene of a first successive displayed image.The second visible light camera 114B may be connected to the secondsee-through image display 180D of the second optical assembly 180B togenerate a second background scene of a second successive displayedimage. The first background scene and the second background scene maypartially overlap to present a three-dimensional observable area of thesuccessive displayed image.

Flexible PCB 140 may be disposed inside the right temple 110A andcoupled to one or more other components housed in the right temple 110A.Although shown as being formed on the circuit boards 140 of the righttemple 110A, the first visible light camera 114A can be formed onanother circuit board (not shown).

FIG. 2A is an illustration depicting a rear view of an example hardwareconfiguration of an electronic eyewear device 100. As shown in FIG. 2A,the electronic eyewear device 100 is in a form configured for wearing bya user, which are eyeglasses in the example of FIG. 2A. The electroniceyewear device 100 can take other forms and may incorporate other typesof frameworks, for example, a headgear, a headset, or a helmet.

In the eyeglasses example, electronic eyewear device 100 includes theframe 105 which includes the right rim 107A connected to the left rim107B via the bridge 106, which is configured to receive a nose of theuser. The right and left rims 107A and 107B include respective apertures175A and 175B, which hold the respective optical elements 180A and 180B,such as a lens and the see-through displays 180C and 180D. As usedherein, the term lens is meant to cover transparent or translucentpieces of glass or plastic having curved and flat surfaces that causelight to converge/diverge or that cause little or noconvergence/divergence.

Although shown as having two optical elements 180A and 180B, theelectronic eyewear device 100 can include other arrangements, such as asingle optical element depending on the application or intended user ofthe electronic eyewear device 100. As further shown, electronic eyeweardevice 100 includes the right temple 110A adjacent the right lateralside 170A of the frame 105 and the left temple 110B adjacent the leftlateral side 170B of the frame 105. The temples 110A and 110B may beintegrated into the frame 105 on the respective sides 170A and 170B (asillustrated) or implemented as separate components attached to the frame105 on the respective sides 170A and 170B. Alternatively, the temples110A and 110B may be integrated into hinged arms 125A and 125B attachedto the frame 105.

In the example of FIG. 2A, an eye tracker 113 is provided that includesan infrared emitter 115 and an infrared camera 120. Visible lightcameras typically include a blue light filter to block infrared lightdetection. In an example, the infrared camera 120 is a visible lightcamera, such as a low-resolution video graphic array (VGA) camera (e.g.,640×480 pixels for a total of 0.3 megapixels), with the blue filterremoved. The infrared emitter 115 and the infrared camera 120 may beco-located on the frame 105. For example, both are shown as connected tothe upper portion of the left rim 107B. The frame 105 or one or more ofthe temples 110A and 110B may include a circuit board (not shown) thatincludes the infrared emitter 115 and the infrared camera 120. Theinfrared emitter 115 and the infrared camera 120 can be connected to thecircuit board by soldering, for example.

Other arrangements of the infrared emitter 115 and infrared camera 120may be implemented, including arrangements in which the infrared emitter115 and infrared camera 120 are both on the right rim 107A, or indifferent locations on the frame 105. For example, the infrared emitter115 may be on the left rim 107B and the infrared camera 120 may be onthe right rim 107A. In another example, the infrared emitter 115 may beon the frame 105 and the infrared camera 120 may be on one of thetemples 110A or 110B, or vice versa. The infrared emitter 115 can beconnected essentially anywhere on the frame 105, right temple 110A, orleft temple 110B to emit a pattern of infrared light. Similarly, theinfrared camera 120 can be connected essentially anywhere on the frame105, right temple 110A, or left temple 110B to capture at least onereflection variation in the emitted pattern of infrared light.

The infrared emitter 115 and infrared camera 120 may be arranged to faceinwards towards an eye of the user with a partial or full field of viewof the eye to identify the respective eye position and gaze direction.For example, the infrared emitter 115 and infrared camera 120 may bepositioned directly in front of the eye, in the upper part of the frame105 or in the temples 110A or 110B at either ends of the frame 105.

FIG. 2B is an illustration depicting a rear view of an example hardwareconfiguration of another electronic eyewear device 200. In this exampleconfiguration, the electronic eyewear device 200 is depicted asincluding an eye scanner 213 on a right temple 210A. As shown, aninfrared emitter 215 and an infrared camera 220 are co-located on theright temple 210A. The eye scanner 213 or one or more components of theeye scanner 213 can be located on the left temple 210B and otherlocations of the electronic eyewear device 200, for example, the frame105. The infrared emitter 215 and infrared camera 220 are like that ofFIG. 2A, but the eye scanner 213 can be varied to be sensitive todifferent light wavelengths as described previously in FIG. 2A. Similarto FIG. 2A, the electronic eyewear device 200 includes a frame 105 whichincludes a right rim 107A which is connected to a left rim 107B via abridge 106. The rims 107A-B may include respective apertures which holdthe respective optical elements 180A and 180B comprising the see-throughdisplays 180C and 180D.

FIG. 2C and FIG. 2D are illustrations depicting rear views of examplehardware configurations of the electronic eyewear device 100, includingtwo different types of see-through image displays 180C and 180D. In oneexample, these see-through image displays 180C and 180D of opticalassemblies 180A and 180B include an integrated image display. As shownin FIG. 2C, the optical assemblies 180A and 180B include a displaymatrix 180C and 180D of any suitable type, such as a liquid crystaldisplay (LCD), an organic light-emitting diode (OLED) display, awaveguide display, or any other such display.

The optical assemblies 180A and 180B also includes an optical layer orlayers 176A-N, which can include lenses, optical coatings, prisms,mirrors, waveguides, optical strips, and other optical components in anycombination. The optical layers 176 can include a prism having asuitable size and configuration and including a first surface forreceiving light from display matrix and a second surface for emittinglight to the eye of the user. The prism of the optical layers 176 mayextend over all or at least a portion of the respective apertures 175Aand 175B formed in the rims 107A and 107B to permit the user to see thesecond surface of the prism when the eye of the user is viewing throughthe corresponding rims 107A and 107B. The first surface of the prism ofthe optical layers 176 faces upwardly from the frame 105 and the displaymatrix overlies the prism so that photons and light emitted by thedisplay matrix impinge the first surface. The prism may be sized andshaped so that the light is refracted within the prism and is directedtowards the eye of the user by the second surface of the prism of theoptical layers 176. In this regard, the second surface of the prism ofthe optical layers 176 can be convex to direct the light towards thecenter of the eye. The prism can be sized and shaped to magnify theimage projected by the see-through image displays 180C and 180D, and thelight travels through the prism so that the image viewed from the secondsurface is larger in one or more dimensions than the image emitted fromthe see-through image displays 180C and 180D.

In another example, the see-through image displays 180C and 180D ofoptical assemblies 180A and 180B may include a projection image displayas shown in FIG. 2D. The optical assemblies 180A and 180B include aprojector 150, which may be a three-color projector using a scanningmirror, a galvanometer, a laser projector, or other types of projectors.During operation, an optical source such as a projector 150 is disposedin or on one of the temples 110A or 110B of the electronic eyeweardevice 100. Optical assemblies 180A and 180B may include one or moreoptical strips 155A-N spaced apart across the width of the lens of theoptical assemblies 180A and 180B or across a depth of the lens betweenthe front surface and the rear surface of the lens.

As the photons projected by the projector 150 travel across the lens ofthe optical assemblies 180A and 180B, the photons encounter the opticalstrips 155. When a particular photon encounters a particular opticalstrip, the photon is either redirected towards the user's eye, or itpasses to the next optical strip. A combination of modulation ofprojector 150, and modulation of optical strips, may control specificphotons or beams of light. In an example, a processor controls theoptical strips 155 by initiating mechanical, acoustic, orelectromagnetic signals. Although shown as having two optical assemblies180A and 180B, the electronic eyewear device 100 can include otherarrangements, such as a single or three optical assemblies, or theoptical assemblies 180A and 180B may have different arrangementsdepending on the application or intended user of the electronic eyeweardevice 100.

As further shown in FIG. 2C and FIG. 2D, electronic eyewear device 100includes a right temple 110A adjacent the right lateral side 170A of theframe 105 and a left temple 110B adjacent the left lateral side 170B ofthe frame 105. The temples 110A and 110B may be integrated into theframe 105 on the respective lateral sides 170A and 170B (as illustrated)or implemented as separate components attached to the frame 105 on therespective sides 170A and 170B. Alternatively, the temples 110A and 110Bmay be integrated into the hinged arms 125A and 125B attached to theframe 105.

In one example, the see-through image displays include the firstsee-through image display 180C and the second see-through image display180D. Electronic eyewear device 100 may include first and secondapertures 175A and 175B that hold the respective first and secondoptical assemblies 180A and 180B. The first optical assembly 180A mayinclude the first see-through image display 180C (e.g., a displaymatrix, or optical strips and a projector in the right temple 110A). Thesecond optical assembly 180B may include the second see-through imagedisplay 180D (e.g., a display matrix, or optical strips and aprojector). The successive field of view of the successive displayedimage may include an angle of view between about 15° to 30°, and morespecifically 24°, measured horizontally, vertically, or diagonally. Thesuccessive displayed image having the successive field of viewrepresents a combined three-dimensional observable area visible throughstitching together of two displayed images presented on the first andsecond image displays.

As used herein, “an angle of view” describes the angular extent of thefield of view associated with the displayed images presented on each ofthe image displays 180C and 180D of optical assemblies 180A and 180B.The “angle of coverage” describes the angle range that a lens of visiblelight cameras 114A or 114B or infrared camera 220 can image. Typically,the image circle produced by a lens is large enough to cover the film orsensor completely, possibly including some vignetting (i.e., a reductionof an image's brightness or saturation toward the periphery compared tothe image center). If the angle of coverage of the lens does not fillthe sensor, the image circle will be visible, typically with strongvignetting toward the edge, and the effective angle of view will belimited to the angle of coverage. The “field of view” is intended todescribe the field of observable area which the user of the electroniceyewear device 100 can see through his or her eyes via the displayedimages presented on the image displays 180C and 180D of the opticalassemblies 180A and 180B. Image display 180C of optical assemblies 180Aand 180B can have a field of view with an angle of coverage between to30°, for example 24°, and have a resolution of 480×480 pixels (orgreater; e.g., 720p, 1080p, 4K, or 8K).

FIG. 3 shows a cross-sectional rear perspective view of the electroniceyewear device of FIG. 2A. The electronic eyewear device 100 includesthe infrared emitter 115, infrared camera 120, a frame front 330, aframe back 335, and a circuit board 340. It can be seen in FIG. 3 thatthe upper portion of the left rim of the frame of the electronic eyeweardevice 100 includes the frame front 330 and the frame back 335. Anopening for the infrared emitter 115 is formed on the frame back 335.

As shown in the encircled cross-section 4 in the upper middle portion ofthe left rim of the frame, a circuit board, which is a flexible PCB 340,is sandwiched between the frame front 330 and the frame back 335. Alsoshown in further detail is the attachment of the left temple 110B to theleft temple 125B via the left hinge 126B. In some examples, componentsof the eye movement tracker 113, including the infrared emitter 115, theflexible PCB 340, or other electrical connectors or contacts may belocated on the left temple 125B or the left hinge 126B.

FIG. 4 is a cross-sectional view through the infrared emitter 115 andthe frame corresponding to the encircled cross-section 4 of theelectronic eyewear device of FIG. 3 . Multiple layers of the electroniceyewear device 100 are illustrated in the cross-section of FIG. 4 , asshown the frame includes the frame front 330 and the frame back 335. Theflexible PCB 340 is disposed on the frame front 330 and connected to theframe back 335. The infrared emitter 115 is disposed on the flexible PCB340 and covered by an infrared emitter cover lens 445. For example, theinfrared emitter 115 is reflowed to the back of the flexible PCB 340.Reflowing attaches the infrared emitter 115 to contact pad(s) formed onthe back of the flexible PCB 340 by subjecting the flexible PCB 340 tocontrolled heat which melts a solder paste to connect the twocomponents. In one example, reflowing is used to surface mount theinfrared emitter 115 on the flexible PCB 340 and electrically connectthe two components. However, it should be understood that through-holescan be used to connect leads from the infrared emitter 115 to theflexible PCB 340 via interconnects, for example.

The frame back 335 includes an infrared emitter opening 450 for theinfrared emitter cover lens 445. The infrared emitter opening 450 isformed on a rear-facing side of the frame back 335 that is configured toface inwards towards the eye of the user. In the example, the flexiblePCB 340 can be connected to the frame front 330 via the flexible PCBadhesive 460. The infrared emitter cover lens 445 can be connected tothe frame back 335 via infrared emitter cover lens adhesive 455. Thecoupling can also be indirect via intervening components.

In an example, the processor 932 utilizes eye tracker 113 to determinean eye gaze direction 230 of a wearer's eye 234 as shown in FIG. 5 , andan eye position 236 of the wearer's eye 234 within an eyebox as shown inFIG. 6 . The eye tracker 113 is a scanner which uses infrared lightillumination (e.g., near-infrared, short-wavelength infrared,mid-wavelength infrared, long-wavelength infrared, or far infrared) tocaptured image of reflection variations of infrared light from the eye234 to determine the gaze direction 230 of a pupil 232 of the eye 234,and also the eye position 236 with respect to a see-through display 180.

The block diagram in FIG. 7 illustrates an example of capturing visiblelight with cameras 114A and 114B. Visible light is captured by the firstvisible light camera 114A with a round field of view (FOV) 111A. Achosen rectangular first raw image 758A is used for image processing byimage processor 912 (FIG. 9 ). Visible light is also captured by thesecond visible light camera 114B with a round FOV 111B. A rectangularsecond raw image 758B chosen by the image processor 912 is used forimage processing by processor 912. The raw images 758A and 758B have anoverlapping field of view 713. The processor 912 processes the rawimages 758A and 758B and generates a three-dimensional image 715 fordisplay by the displays 180.

FIG. 8A is a block diagram illustrating a circuit 800 including a powermanagement circuit. Circuit 800 includes frame electronics 802 disposedin the frame 105, including the processor 932 (shown in FIG. 9 ), andtemple electronics 804 disposed in temple 125, such as peripheralelectronic components 919 including a flash memory and a WiFitransceiver. The frame electronics 802 includes a power managementintegrated circuit (PMIC) 806 including a voltage controller 805 that iscontrolled by the processor 932. The PMIC 806 supplies power to theprocessor 932, and it is configured to send analog control signals via aplurality of electrical conductors 808 that are coupled to peripheralcomponents 919 in temple 125. A separate dedicated electrical conductor808 extends from the PMIC 806 to each of the peripheral components 919through hinge 126. A high-impedance PMIC 806 generates a separatehigh-impedance analog control signal including a voltage is communicatedfrom the via the respective electrical conductor 808 to each of theperipheral components 919. The analog control signals control arespective DC/DC voltage regulator 812 to generate a rail voltage on avoltage rail 810. The rail voltage on each voltage rail 810 can bedifferent, such that the rail voltage is custom set by the PMIC 806 tomatch the voltage requirement of the peripheral component 919. In anexample, the PMIC 806 controls the DC/DC voltage regulator 812associated with the flash memory to generate a rail voltage of 3.3 voltsand controls the DC/DC voltage regulator 812 associated with the WiFitransceiver to generate a rail voltage of 3.5 volts. A battery 814 islocated in the temple 125 and provides power via a voltage bus 816 toeach of the DC/DC regulators 812 that power the respective peripheralcomponents 919, for example, the flash memory and the WiFi transmitter.In an example, the battery voltage is 4.0 volts which is higher than therail voltages. In another example, the battery voltage is 3.0 volts andthe DC/DC voltage regulator 812 is a buck or a buck-boost converter.

The circuit 800 includes an analog control loop circuit 820 for eachperipheral component 919. As shown in FIG. 8B, the control loop circuit820 includes a unity gain amplifier 821 configured as a voltagefollower, where the amplifier 821 has an input 822 coupled to therespective electrical conductor 808, and a feedback input 824 coupled toan output 810 of the respective DC/DC regulator 812. DC/DC convertersare well-known and various types can be used. The amplifier 821 has anoutput 826 having a reference voltage that follows the voltage onconductor 808. The reference voltage is coupled to a feedback input 828of the respective DC/DC regulator 812 and configures the respectiveDC/DC regulator 812 as a voltage follower DC/DC regulator, such that arail voltage provided on the output 810 follows the voltage generated bythe PMIC 806 on the respective electrical conductor 808. Each DC/DCregulator 812 is powered by the battery 814 via conductor 830, such thatpower for the DC/DC regulator 812 is not provided via conductors 808across the hinge 126. By sinking/sourcing current from the amplifieroutput 826 into the regulator feedback input 828, it spoofs theregulator's reference voltage such that the regulator's output voltageat output 810 tracks the reference voltage generated by the PMIC 806.

The circuit 800 supports dynamic voltage scaling. The circuit 800 doesnot require any software, as the voltage control is done in hardware.There are no large electrical conductors passing through the hinge 126,and only thin electrical conductors are used, such as 32-gauge wires,which is important allow the hinge 126 to freely rotate and not bind.There is minimal resistance in the respective power rail 810 because theDC/DC regulator 812 is positioned close to the peripheral 919. There islittle latency in the processor 932 controlling the rail voltages onvoltage rails 810 as the electrical conductors 808 are directly coupledto the analog control loops 820.

FIG. 9 depicts a high-level functional block diagram including exampleelectronic components disposed in the electronic eyewear device 100/200.The illustrated electronic components include the processor 932, thememory 934, and the see-through image display 180C and 180D includingthe embedded antennas 808.

Memory 934 includes instructions for execution by processor 932 toimplement functionality of eyewear 100/200, including instructions forprocessor 932 to control in the image 715. Processor 932 receives powerfrom battery (not shown) and executes the instructions stored in memory934, or integrated with the processor 932 on-chip, to performfunctionality of eyewear 100/200, and communicating with externaldevices via wireless connections.

A user interface adjustment system 900 includes a wearable device, whichis the electronic eyewear device 100 with an eye movement tracker 213(e.g., shown as infrared emitter 215 and infrared camera 220 in FIG.2B). User interface adjustments system 900 also includes a mobile device100 and a server system 998 connected via various networks. Mobiledevice 100 may be a smartphone, tablet, laptop computer, access point,or any other such device capable of connecting with electronic eyeweardevice 100 using both a low-power wireless connection 925 and ahigh-speed wireless connection 937. Mobile device 100 is connected toserver system 998 and network 995. The network 995 may include anycombination of wired and wireless connections.

Electronic eyewear device 100 includes at least two visible lightcameras 114 (one associated with one side (e.g., the right lateral side170A) and one associated with the other side (e.g., left lateral side170B). Electronic eyewear device 100 further includes two see-throughimage displays 180C-D of the optical assembly 180A-B (one associatedwith each side). Electronic eyewear device 100 also includes imagedisplay driver 924, image processor 912, low-power circuitry 920, andhigh-speed circuitry 930. The components shown in FIG. 9 for theelectronic eyewear device 100/200 are located on one or more circuitboards, for example a PCB or flexible PCB, in the temples 110A-B aspreviously described. Alternatively, or additionally, the depictedcomponents can be located in the temples, frames, hinges, or bridge ofthe electronic eyewear device 100. The visible light cameras 114A-B caninclude digital camera elements such as a complementarymetal-oxide-semiconductor (CMOS) image sensor, charge coupled device, alens, or any other respective visible or light capturing elements thatmay be used to capture data, including images of scenes with unknownobjects.

Eye movement tracking programming 945 implements the user interfacefield of view adjustment instructions, including, to cause theelectronic eyewear device 100 to track, via the eye movement tracker213, the eye movement of the eye of the user of the electronic eyeweardevice 100. Other implemented instructions (functions) cause theelectronic eyewear device 100 to determine, a field of view adjustmentto the initial field of view of an initial displayed image based on thedetected eye movement of the user corresponding to a successive eyedirection. Further implemented instructions generate a successivedisplayed image of the sequence of displayed images based on the fieldof view adjustment. The successive displayed image is produced asvisible output to the user via the user interface. This visible outputappears on the see-through image displays 180C-D of optical assembly180A-B, which is driven by image display driver 924 to present thesequence of displayed images, including the initial displayed image withthe initial field of view and the successive displayed image with thesuccessive field of view.

As shown in FIG. 9 , high-speed circuitry 930 includes high-speedprocessor 932, memory 934, and high-speed wireless circuitry 936. In theexample, the image display driver 924 is coupled to the high-speedcircuitry 930 and operated by the high-speed processor 932 to drive theimage displays 180C-D of the optical assembly 180A-B to create thevirtual image. High-speed processor 932 may be any processor capable ofmanaging high-speed communications and operation of any generalcomputing system needed for electronic eyewear device 100. High-speedprocessor 932 includes processing resources needed for managinghigh-speed data transfers on high-speed wireless connection 937 to awireless local area network (WLAN) using high-speed wireless circuitry936. In certain examples, the high-speed processor 932 executes anoperating system such as a LINUX operating system or other suchoperating system of the electronic eyewear device 100 and the operatingsystem is stored in memory 934 for execution. In addition to any otherresponsibilities, the high-speed processor 932 executing a softwarearchitecture for the electronic eyewear device 100 is used to managedata transfers with high-speed wireless circuitry 936. In certainexamples, high-speed wireless circuitry 936 is configured to implementInstitute of Electrical and Electronic Engineers (IEEE) 802.11communication standards, also referred to herein as Wi-Fi. In otherexamples, other high-speed communications standards may be implementedby high-speed wireless circuitry 936.

Low-power wireless circuitry 924 and the high-speed wireless circuitry936 of the electronic eyewear device 100 can include short rangetransceivers (e.g., UWB or Bluetooth™) and wireless wide, local, or widearea network transceivers (e.g., cellular or WiFi) including antennas808. Mobile device 100, including the transceivers communicating via thelow-power wireless connection 925 and high-speed wireless connection937, may be implemented using details of the architecture of theelectronic eyewear device 100, as can other elements of network 995.

Memory 934 includes any storage device capable of storing various dataand applications, including, among other things, color maps, camera datagenerated by the visible light cameras 114A-B and the image processor912, as well as images generated for display by the image display driver924 on the see-through image displays 180C-D of the optical assembly180A-B. While memory 934 is shown as integrated with high-speedcircuitry 930, in other examples, memory 934 may be an independentstandalone element of the electronic eyewear device 100. In certain suchexamples, electrical routing lines may provide a connection through achip that includes the high-speed processor 932 from the image processor912 or low-power processor 922 to the memory 934. In other examples, thehigh-speed processor 932 may manage addressing of memory 934 such thatthe low-power processor 922 will boot the high-speed processor 932 anytime that a read or write operation involving memory 934 is needed.

Server system 998 may be one or more computing devices as part of aservice or network computing system, for example, that include aprocessor, a memory, and network communication interface to communicateover the network 995 with the mobile device 100 and electronic eyeweardevice 100. Electronic eyewear device 100 is connected with a hostcomputer. For example, the electronic eyewear device 100 is paired withthe mobile device 100 via the high-speed wireless connection 937 orconnected to the server system 998 via the network 995.

Output components of the electronic eyewear device 100 include visualcomponents, such as the image displays 180C-D of optical assembly 180A-Bas described in FIGS. 2C-D (e.g., a display such as a liquid crystaldisplay (LCD), a plasma display panel (PDP), a light emitting diode(LED) display, a projector, or a waveguide). The image displays 180C-Dof the optical assembly 180A-B are driven by the image display driver924. The output components of the electronic eyewear device 100 furtherinclude acoustic components (e.g., speakers), haptic components (e.g., avibratory motor), other signal generators, and so forth. The inputcomponents of the electronic eyewear device 100, the mobile device 100,and server system 998, may include alphanumeric input components (e.g.,a keyboard, a touch screen configured to receive alphanumeric input, aphoto-optical keyboard, or other alphanumeric input components),point-based input components (e.g., a mouse, a touchpad, a trackball, ajoystick, a motion sensor, or other pointing instruments), tactile inputcomponents (e.g., a physical button, a touch screen that provideslocation and force of touches or touch gestures, or other tactile inputcomponents), audio input components (e.g., a microphone), and the like.

Electronic eyewear device 100 may optionally include additionalperipheral device elements 919. Such peripheral device elements mayinclude biometric sensors, additional sensors, or display elementsintegrated with electronic eyewear device 100. For example, peripheraldevice elements 919 may include any I/O components including outputcomponents, motion components, position components, or any other suchelements described herein. The electronic eyewear device 100 can takeother forms and may incorporate other types of frameworks, for example,a headgear, a headset, or a helmet.

For example, the biometric components of the user interface field ofview adjustment may include components to detect expressions (e.g., handexpressions, facial expressions, vocal expressions, body gestures, oreye tracking), measure biosignals (e.g., blood pressure, heart rate,body temperature, perspiration, or brain waves), identify a person(e.g., voice identification, retinal identification, facialidentification, fingerprint identification, or electroencephalogrambased identification), and the like. The motion components includeacceleration sensor components (e.g., accelerometer), gravitation sensorcomponents, rotation sensor components (e.g., gyroscope), and so forth.The position components include location sensor components to generatelocation coordinates (e.g., a Global Positioning System (GPS) receivercomponent), WiFi or Bluetooth™ transceivers to generate positioningsystem coordinates, altitude sensor components (e.g., altimeters orbarometers that detect air pressure from which altitude may be derived),orientation sensor components (e.g., magnetometers), and the like. Suchpositioning system coordinates can also be received over wirelessconnections 925 and 937 from the mobile device 100 via the low-powerwireless circuitry 924 or high-speed wireless circuitry 936.

According to some examples, an “application” or “applications” areprogram(s) that execute functions defined in the programs. Variousprogramming languages can be employed to create one or more of theapplications, structured in a variety of manners, such asobject-oriented programming languages (e.g., Objective-C, Java, or C++)or procedural programming languages (e.g., C or assembly language). In aspecific example, a third-party application (e.g., an applicationdeveloped using the ANDROID™ or IOS™ software development kit (SDK) byan entity other than the vendor of the particular platform) may bemobile software running on a mobile operating system such as IOS™,ANDROID™, WINDOWS® Phone, or other mobile operating systems. In thisexample, the third-party application can invoke API calls provided bythe operating system to facilitate functionality described herein.

FIG. 10 is a flowchart 1000 of example steps for controlling the voltageat the voltage rails of each of the DC/DC converters.

At block 1002 the processor 932 instructs the PMIC 806 to generate aselected voltage rail on the regulator output 810 for each of theperipheral components 919. The PMIC 806 generates a high-impedancecontrol signal including a voltage on the electrical conductor 808 forthe respective peripheral components 919. In an example, the controlsignal is low current, such as 1 microamp, such that little power, suchas 1 mW, is used to control the rail voltages.

At block 1004 the control signals are communicated via the respectiveelectrical conductor 808 to the input 822 of the respective analogcontrol loop 820. The feedback input 824 of the analog control loop 820senses the output voltage provided on the respective voltage rail 810,and the output 826 of analog control loop 820 provides a control signalto the feedback input of the respective DC/DC converter 812.

At block 1006 the respective analog control loop 820 controls therespective DC/DC converter 812 to generate the output voltage on thevoltage rail 810 that matches the voltage of the respective controlsignal provided by the PMIC 806. The analog control loop 820 and theDC/DC regulator, together, form a closed-loop system acting as a voltagefollower regulator.

It will be understood that the terms and expressions used herein havethe ordinary meaning as is accorded to such terms and expressions withrespect to their corresponding respective areas of inquiry and studyexcept where specific meanings have otherwise been set forth herein.Relational terms such as first and second and the like may be usedsolely to distinguish one entity or action from another withoutnecessarily requiring or implying any actual such relationship or orderbetween such entities or actions. The terms “comprises,” “comprising,”“includes,” “including,” or any other variation thereof, are intended tocover a non-exclusive inclusion, such that a process, method, article,or apparatus that comprises or includes a list of elements or steps doesnot include only those elements or steps but may include other elementsor steps not expressly listed or inherent to such process, method,article, or apparatus. An element preceded by “a” or “an” does not,without further constraints, preclude the existence of additionalidentical elements in the process, method, article, or apparatus thatcomprises the element.

Unless otherwise stated, all measurements, values, ratings, positions,magnitudes, sizes, and other specifications that are set forth in thisspecification, including in the claims that follow, are approximate, notexact. Such amounts are intended to have a reasonable range that isconsistent with the functions to which they relate and with what iscustomary in the art to which they pertain. For example, unlessexpressly stated otherwise, a parameter value or the like may vary by asmuch as ±10% from the stated amount.

In addition, in the foregoing Detailed Description, various features aregrouped together in various examples for the purpose of streamlining thedisclosure. This method of disclosure is not to be interpreted asreflecting an intention that the claimed examples require more featuresthan are expressly recited in each claim. Rather, as the followingclaims reflect, the subject matter to be protected lies in less than allfeatures of any single disclosed example. Thus, the following claims arehereby incorporated into the Detailed Description, with each claimstanding on its own as a separately claimed subject matter.

While the foregoing has described what are considered to be the bestmode and other examples, it is understood that various modifications maybe made therein and that the subject matter disclosed herein may beimplemented in various forms and examples, and that they may be appliedin numerous applications, only some of which have been described herein.It is intended by the following claims to claim any and allmodifications and variations that fall within the true scope of thepresent concepts.

What is claimed is:
 1. An electronic eyewear device, comprising: atemple comprising a plurality of electronic components and a pluralityof voltage regulators, each voltage regulator having a voltage rail,wherein the voltage rail of each of the voltage regulators is coupled toa respective one of the electronic components; a frame comprising avoltage controller configured to control the plurality of voltageregulators; and a plurality of electrical conductors each extending fromthe voltage controller to a corresponding one of the voltage regulators,wherein the voltage controller is configured to generate a voltagecontrol signal that is used by each of the voltage regulators via therespective electrical conductor to set a rail voltage of the respectivevoltage rail.
 2. The electronic eyewear device of claim 1, furthercomprising a separate analog control loop circuit coupled to each of thevoltage regulators, wherein the analog control loop circuit comprises avoltage follower amplifier.
 3. The electronic eyewear device of claim 2,wherein each of the analog control loop circuits configures therespective voltage regulator as a voltage follower regulator, whereinthe respective rail voltage follows a voltage of the respective voltagecontrol signal.
 4. The electronic eyewear device of claim 3, whereineach of analog control loop circuits have an input coupled to therespective electrical conductor, and a feedback input coupled to thevoltage rail of the respective voltage follower regulator.
 5. Theelectronic eyewear device of claim 4, wherein each of the analog controlloop circuits has an output coupled to a feedback input of therespective voltage follower regulator.
 6. The electronic eyewear deviceof claim 3, wherein the temple further comprises a battery coupled toeach of the voltage follower regulators.
 7. The electronic eyeweardevice of claim 6, wherein the battery has a battery voltage that ishigher that the rail voltage of each of the voltage follower regulators.8. The electronic eyewear device of claim 7, wherein the voltagefollower regulators each comprise a voltage follower DC/DC regulator. 9.The electronic eyewear device of claim 6, wherein each of the electroniccomponents is configured to be powered by only the battery.
 10. Theelectronic eyewear device of claim 1, further comprising a powermanagement integrated circuit (PMIC) including the voltage controller.11. A method of controlling power in an electronic eyewear device, theelectronic eyewear device comprising a temple comprising a plurality ofelectronic components and a plurality of voltage regulators, eachvoltage regulator having a respective voltage rail, wherein the voltagerail of each of the voltage regulators is coupled to a respective one ofthe electronic components, a frame comprising a voltage controllerconfigured to control the plurality of voltage regulators, and aseparate electrical conductor extending from the voltage controller toeach of the voltage regulators, the method comprising the voltagecontroller: generating a voltage control signal controlling each of thevoltage regulators via the respective electrical conductor; and settinga rail voltage of the respective voltage rail as a function of therespective voltage control signal using the voltage regulator.
 12. Themethod of claim 11, wherein the electronic eyewear device furthercomprises a separate analog control loop circuit coupled to each of thevoltage regulators, and wherein the method further comprises the voltagecontroller sending the respective voltage control signal to therespective analog control loop circuit.
 13. The method of claim 12,wherein each of the analog control loop circuits configures therespective voltage regulator as a voltage follower regulator such thatthe respective rail voltage follows a voltage of the respective voltagecontrol signal.
 14. The method of claim 13, wherein each of analogcontrol loop circuits has an input coupled to the respective electricalconductor, and a feedback input coupled to the voltage rail of therespective voltage follower regulator.
 15. The method of claim 14,wherein each of the analog control loop circuit has an output coupled toa feedback input of the respective voltage follower regulator.
 16. Themethod of claim 13, wherein the temple further comprises a batterycoupled to each of the voltage follower regulators.
 17. The method ofclaim 16, wherein the battery has a battery voltage that is higher thatthe rail voltage of each of the voltage follower regulators.
 18. Themethod of claim 17, wherein the voltage follower regulators eachcomprise a voltage follower DC/DC regulator.
 19. The method of claim 11,further comprising a power management integrated circuit (PMIC)including the voltage controller.
 20. A power supply system, comprising:a plurality of electronic components and a plurality of voltageregulators configured to be disposed in a temple of an electroniceyewear device, each voltage regulator having a voltage rail, whereinthe voltage rail of each of the voltage regulators is coupled to arespective one of the electronic components; a voltage controllerconfigured to be disposed in a frame of the electronic eyewear deviceand control the plurality of voltage regulators; and a plurality ofelectrical conductors each extending from the voltage controller to acorresponding one of the voltage regulators, wherein the voltagecontroller is configured to generate a voltage control signal that isused by each of the voltage regulators via the respective electricalconductor to set a rail voltage of the respective voltage rail.